diff --git a/addons/website_forum/controllers/main.py b/addons/website_forum/controllers/main.py
index 2a614b965ed..d8f3339cd9c 100644
--- a/addons/website_forum/controllers/main.py
+++ b/addons/website_forum/controllers/main.py
@@ -20,6 +20,7 @@ from odoo.addons.portal.controllers.portal import _build_url_w_params
 from odoo.exceptions import UserError
 from odoo.http import request
 
+
 _logger = logging.getLogger(__name__)
 
 
@@ -179,9 +180,9 @@ class WebsiteForum(WebsiteProfile):
         return request.render("website_forum.faq_karma", values)
 
     @http.route('/forum/get_tags', type='http', auth="public", methods=['GET'], website=True, sitemap=False)
-    def tag_read(self, query='', limit=25, **post):
+    def tag_read(self, forum_id, query='', limit=25, **post):
         data = request.env['forum.tag'].search_read(
-            domain=[('name', '=ilike', (query or '') + "%")],
+            domain=[('forum_id', '=', int(forum_id)), ('name', '=ilike', (query or '') + "%")],
             fields=['id', 'name'],
             limit=int(limit),
         )
diff --git a/addons/website_forum/models/forum.py b/addons/website_forum/models/forum.py
index 2ee1481f971..3068628130a 100644
--- a/addons/website_forum/models/forum.py
+++ b/addons/website_forum/models/forum.py
@@ -222,7 +222,6 @@ class Forum(models.Model):
         self._update_website_count()
         return super(Forum, self).unlink()
 
-    @api.model
     def _tag_to_write_vals(self, tags=''):
         Tag = self.env['forum.tag']
         post_tags = []
@@ -231,7 +230,7 @@ class Forum(models.Model):
         for tag in (tag for tag in tags.split(',') if tag):
             if tag.startswith('_'):  # it's a new tag
                 # check that not already created meanwhile or maybe excluded by the limit on the search
-                tag_ids = Tag.search([('name', '=', tag[1:])])
+                tag_ids = Tag.search([('name', '=', tag[1:]), ('forum_id', '=', self.id)])
                 if tag_ids:
                     existing_keep.append(int(tag_ids[0]))
                 else:
diff --git a/addons/website_forum/static/src/js/website_forum.js b/addons/website_forum/static/src/js/website_forum.js
index d607ac8fc92..a241d586c2c 100644
--- a/addons/website_forum/static/src/js/website_forum.js
+++ b/addons/website_forum/static/src/js/website_forum.js
@@ -94,6 +94,7 @@ publicWidget.registry.websiteForum = publicWidget.Widget.extend({
                     return {
                         query: term,
                         limit: 50,
+                        forum_id: $('#wrapwrap').data('forum_id'),
                     };
                 },
                 results: function (data) {
diff --git a/addons/website_forum/tests/test_forum.py b/addons/website_forum/tests/test_forum.py
index b9d3bcdb94a..98f3781dd1a 100644
--- a/addons/website_forum/tests/test_forum.py
+++ b/addons/website_forum/tests/test_forum.py
@@ -436,3 +436,25 @@ class TestForum(TestForumCommon):
             not discussions_post.uid_has_answered or discussions_post.forum_id.mode == 'discussions', True)
         self.assertEqual(
             discussions_post.uid_has_answered and discussions_post.forum_id.mode == 'questions', False)
+
+    def test_tag_creation_multi_forum(self):
+        Post = self.env['forum.post']
+        forum_1 = self.forum
+        forum_2 = forum_1.copy({
+            'name': 'Questions Forum'
+        })
+        self.user_portal.karma = KARMA['tag_create']
+        Post.with_user(self.user_portal).create({
+            'name': "Post Forum 1",
+            'forum_id': forum_1.id,
+            'tag_ids': forum_1._tag_to_write_vals('_Food'),
+        })
+        Post.with_user(self.user_portal).create({
+            'name': "Post Forum 2",
+            'forum_id': forum_2.id,
+            'tag_ids': forum_2._tag_to_write_vals('_Food'),
+        })
+        food_tags = self.env['forum.tag'].search([('name', '=', 'Food')])
+        self.assertEqual(len(food_tags), 2, "One Food tag should have been created in each forum.")
+        self.assertIn(forum_1, food_tags.forum_id, "One Food tag should have been created for forum 1.")
+        self.assertIn(forum_2, food_tags.forum_id, "One Food tag should have been created for forum 2.")